APA引文

Robert H. Frank. (2004). Principles of economics. Boston: McGraw-Hill.

Trích dẫn kiểu Chicago

Robert H. Frank. Principles of Economics. Boston: McGraw-Hill, 2004.

MLA引文

Robert H. Frank. Principles of Economics. Boston: McGraw-Hill, 2004.

警告：这些引文格式不一定是100％准确.